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1
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Browne J, Chipps KA, Schmidt K, Schatz H, Ahn S, Pain SD, Montes F, Ong WJ, Greife U, Allen J, Bardayan DW, Blackmon JC, Blankstein D, Cha S, Chae KY, Febbraro M, Hall MR, Jones KL, Kontos A, Meisel Z, O'Malley PD, Schmitt KT, Smith K, Smith MS, Thompson P, Toomey R, Vostinar M, Walter D. First Direct Measurement Constraining the ^{34}Ar(α,p)^{37}K Reaction Cross Section for Mixed Hydrogen and Helium Burning in Accreting Neutron Stars. Phys Rev Lett 2023; 130:212701. [PMID: 37295108 DOI: 10.1103/physrevlett.130.212701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2022] [Revised: 09/19/2022] [Accepted: 05/02/2023] [Indexed: 06/12/2023]
Abstract
The rate of the final step in the astrophysical αp process, the ^{34}Ar(α,p)^{37}K reaction, suffers from large uncertainties due to a lack of experimental data, despite having a considerable impact on the observable light curves of x-ray bursts and the composition of the ashes of hydrogen and helium burning on accreting neutron stars. We present the first direct measurement constraining the ^{34}Ar(α,p)^{37}K reaction cross section, using the Jet Experiments in Nuclear Structure and Astrophysics gas jet target. The combined cross section for the ^{34}Ar,Cl(α,p)^{37}K,Ar reaction is found to agree well with Hauser-Feshbach predictions. The ^{34}Ar(α,2p)^{36}Ar cross section, which can be exclusively attributed to the ^{34}Ar beam component, also agrees to within the typical uncertainties quoted for statistical models. This indicates the applicability of the statistical model for predicting astrophysical (α,p) reaction rates in this part of the αp process, in contrast to earlier findings from indirect reaction studies indicating orders-of-magnitude discrepancies. This removes a significant uncertainty in models of hydrogen and helium burning on accreting neutron stars.
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Affiliation(s)
- J Browne
- Department of Physics and Astronomy and National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824
- Joint Institute for Nuclear Astrophysics (JINA-CEE), Michigan State University, East Lansing, Michigan 48824
| | - K A Chipps
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996
| | - Konrad Schmidt
- Department of Physics and Astronomy and National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824
- Joint Institute for Nuclear Astrophysics (JINA-CEE), Michigan State University, East Lansing, Michigan 48824
- Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstrasse 400, 01328 Dresden, Germany
| | - H Schatz
- Department of Physics and Astronomy and National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824
- Joint Institute for Nuclear Astrophysics (JINA-CEE), Michigan State University, East Lansing, Michigan 48824
| | - S Ahn
- Department of Physics and Astronomy and National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824
- Joint Institute for Nuclear Astrophysics (JINA-CEE), Michigan State University, East Lansing, Michigan 48824
| | - S D Pain
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996
| | - F Montes
- Department of Physics and Astronomy and National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824
- Joint Institute for Nuclear Astrophysics (JINA-CEE), Michigan State University, East Lansing, Michigan 48824
| | - W J Ong
- Department of Physics and Astronomy and National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824
- Joint Institute for Nuclear Astrophysics (JINA-CEE), Michigan State University, East Lansing, Michigan 48824
| | - U Greife
- Physics Department, Colorado School of Mines, Golden, Colorado 80401
| | - J Allen
- Department of Physics and Astronomy, University of Notre Dame, Notre Dame, Indiana 46556
| | - D W Bardayan
- Joint Institute for Nuclear Astrophysics (JINA-CEE), Michigan State University, East Lansing, Michigan 48824
- Department of Physics and Astronomy, University of Notre Dame, Notre Dame, Indiana 46556
| | - J C Blackmon
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803
| | - D Blankstein
- Department of Physics and Astronomy, University of Notre Dame, Notre Dame, Indiana 46556
| | - S Cha
- Department of Physics, Sungkyunkwan University, Suwon 16419, Korea
| | - K Y Chae
- Department of Physics, Sungkyunkwan University, Suwon 16419, Korea
| | - M Febbraro
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
| | - M R Hall
- Department of Physics and Astronomy, University of Notre Dame, Notre Dame, Indiana 46556
| | - K L Jones
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996
| | - A Kontos
- Department of Physics and Astronomy and National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824
- Joint Institute for Nuclear Astrophysics (JINA-CEE), Michigan State University, East Lansing, Michigan 48824
| | - Z Meisel
- Department of Physics and Astronomy and National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824
- Joint Institute for Nuclear Astrophysics (JINA-CEE), Michigan State University, East Lansing, Michigan 48824
| | - P D O'Malley
- Department of Physics and Astronomy, University of Notre Dame, Notre Dame, Indiana 46556
| | - K T Schmitt
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
| | - K Smith
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996
| | - M S Smith
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
| | - P Thompson
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996
| | - R Toomey
- Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854
| | - M Vostinar
- Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854
| | - D Walter
- Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854
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2
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Febbraro M, deBoer RJ, Pain SD, Toomey R, Becchetti FD, Boeltzig A, Chen Y, Chipps KA, Couder M, Jones KL, Lamere E, Liu Q, Lyons S, Macon KT, Morales L, Peters WA, Robertson D, Rasco BC, Smith K, Seymour C, Seymour G, Smith MS, Stech E, Kolk BV, Wiescher M. New ^{13}C(α,n)^{16}O Cross Section with Implications for Neutrino Mixing and Geoneutrino Measurements. Phys Rev Lett 2020; 125:062501. [PMID: 32845657 DOI: 10.1103/physrevlett.125.062501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Revised: 05/07/2020] [Accepted: 05/29/2020] [Indexed: 06/11/2023]
Abstract
Precise antineutrino measurements are very sensitive to proper background characterization. We present an improved measurement of the ^{13}C(α,n)^{16}O reaction cross section which constitutes significant background for large ν[over ¯] detectors. We greatly improve the precision and accuracy by utilizing a setup that is sensitive to the neutron energies while making measurements of the excited state transitions via secondary γ-ray detection. Our results shows a 54% reduction in the background contributions from the ^{16}O(3^{-},6.13 MeV) state used in the KamLAND analysis.
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Affiliation(s)
- M Febbraro
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - R J deBoer
- The Joint Institute for Nuclear Astrophysics, Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - S D Pain
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - R Toomey
- Rutgers University, Piscataway, New Jersey 08854, USA
- University of Surrey, GU2 7XH, Guildford, United Kingdom
| | - F D Becchetti
- University of Michigan, Ann Arbor, Michigan 48109, USA
| | - A Boeltzig
- The Joint Institute for Nuclear Astrophysics, Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - Y Chen
- The Joint Institute for Nuclear Astrophysics, Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - K A Chipps
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - M Couder
- The Joint Institute for Nuclear Astrophysics, Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - K L Jones
- University of Tennessee, Knoxville, Tennessee 37996, USA
| | - E Lamere
- The Joint Institute for Nuclear Astrophysics, Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - Q Liu
- The Joint Institute for Nuclear Astrophysics, Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - S Lyons
- The Joint Institute for Nuclear Astrophysics, Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - K T Macon
- The Joint Institute for Nuclear Astrophysics, Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - L Morales
- The Joint Institute for Nuclear Astrophysics, Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - W A Peters
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- University of Tennessee, Knoxville, Tennessee 37996, USA
| | - D Robertson
- The Joint Institute for Nuclear Astrophysics, Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - B C Rasco
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- University of Tennessee, Knoxville, Tennessee 37996, USA
| | - K Smith
- University of Tennessee, Knoxville, Tennessee 37996, USA
| | - C Seymour
- The Joint Institute for Nuclear Astrophysics, Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - G Seymour
- The Joint Institute for Nuclear Astrophysics, Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - M S Smith
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - E Stech
- The Joint Institute for Nuclear Astrophysics, Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - B Vande Kolk
- The Joint Institute for Nuclear Astrophysics, Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - M Wiescher
- The Joint Institute for Nuclear Astrophysics, Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
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3
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Hall MR, Bardayan DW, Baugher T, Lepailleur A, Pain SD, Ratkiewicz A, Ahn S, Allen JM, Anderson JT, Ayangeakaa AD, Blackmon JC, Burcher S, Carpenter MP, Cha SM, Chae KY, Chipps KA, Cizewski JA, Febbraro M, Hall O, Hu J, Jiang CL, Jones KL, Lee EJ, O'Malley PD, Ota S, Rasco BC, Santiago-Gonzalez D, Seweryniak D, Sims H, Smith K, Tan WP, Thompson P, Thornsberry C, Varner RL, Walter D, Wilson GL, Zhu S. Key ^{19}Ne States Identified Affecting γ-Ray Emission from ^{18}F in Novae. Phys Rev Lett 2019; 122:052701. [PMID: 30822026 DOI: 10.1103/physrevlett.122.052701] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2018] [Revised: 11/15/2018] [Indexed: 06/09/2023]
Abstract
Detection of nuclear-decay γ rays provides a sensitive thermometer of nova nucleosynthesis. The most intense γ-ray flux is thought to be annihilation radiation from the β^{+} decay of ^{18}F, which is destroyed prior to decay by the ^{18}F(p,α)^{15}O reaction. Estimates of ^{18}F production had been uncertain, however, because key near-threshold levels in the compound nucleus, ^{19}Ne, had yet to be identified. We report the first measurement of the ^{19}F(^{3}He,tγ)^{19}Ne reaction, in which the placement of two long-sought 3/2^{+} levels is suggested via triton-γ-γ coincidences. The precise determination of their resonance energies reduces the upper limit of the rate by a factor of 1.5-17 at nova temperatures and reduces the average uncertainty on the nova detection probability by a factor of 2.1.
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Affiliation(s)
- M R Hall
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - D W Bardayan
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - T Baugher
- Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08903, USA
| | - A Lepailleur
- Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08903, USA
| | - S D Pain
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - A Ratkiewicz
- Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08903, USA
| | - S Ahn
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - J M Allen
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - J T Anderson
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - A D Ayangeakaa
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - J C Blackmon
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - S Burcher
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - M P Carpenter
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - S M Cha
- Department of Physics, Sungkyunkwan University, Suwon 16419, South Korea
| | - K Y Chae
- Department of Physics, Sungkyunkwan University, Suwon 16419, South Korea
| | - K A Chipps
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - J A Cizewski
- Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08903, USA
| | - M Febbraro
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - O Hall
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
- Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom
| | - J Hu
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - C L Jiang
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - K L Jones
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - E J Lee
- Department of Physics, Sungkyunkwan University, Suwon 16419, South Korea
| | - P D O'Malley
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - S Ota
- Physics Division, Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - B C Rasco
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - D Santiago-Gonzalez
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - D Seweryniak
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - H Sims
- Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08903, USA
- Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom
| | - K Smith
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - W P Tan
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - P Thompson
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - C Thornsberry
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - R L Varner
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - D Walter
- Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08903, USA
| | - G L Wilson
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
- Department of Physics and Applied Physics, University of Massachusetts Lowell, Lowell, Massachusetts 01854, USA
| | - S Zhu
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
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4
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Ratkiewicz A, Cizewski JA, Escher JE, Potel G, Burke JT, Casperson RJ, McCleskey M, Austin RAE, Burcher S, Hughes RO, Manning B, Pain SD, Peters WA, Rice S, Ross TJ, Scielzo ND, Shand C, Smith K. Towards Neutron Capture on Exotic Nuclei: Demonstrating (d,pγ) as a Surrogate Reaction for (n,γ). Phys Rev Lett 2019; 122:052502. [PMID: 30822004 DOI: 10.1103/physrevlett.122.052502] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2018] [Revised: 11/09/2018] [Indexed: 06/09/2023]
Abstract
The neutron-capture reaction plays a critical role in the synthesis of the elements in stars and is important for societal applications including nuclear power generation and stockpile-stewardship science. However, it is difficult-if not impossible-to directly measure neutron capture cross sections for the exotic, short-lived nuclei that participate in these processes. In this Letter we demonstrate a new technique which can be used to indirectly determine neutron-capture cross sections for exotic systems. This technique makes use of the (d,p) transfer reaction, which has long been used as a tool to study the structure of nuclei. Recent advances in reaction theory, together with data collected using this reaction, enable the determination of neutron-capture cross sections for short-lived nuclei. A benchmark study of the ^{95}Mo(d,p) reaction is presented, which illustrates the approach and provides guidance for future applications of the method with short-lived isotopes produced at rare isotope accelerators.
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Affiliation(s)
- A Ratkiewicz
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
- Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08901, USA
| | - J A Cizewski
- Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08901, USA
| | - J E Escher
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - G Potel
- Michigan State University, East Lansing, Michigan 48824, USA
- Facility for Rare Isotope Beams, East Lansing, Michigan 48824, USA
| | - J T Burke
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R J Casperson
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M McCleskey
- Cyclotron Institute, Texas A&M University, College Station, Texas 77843, USA
| | - R A E Austin
- Astronomy and Physics Department, Saint Mary's University, Halifax, NS BH3 3C3, Canada
| | - S Burcher
- Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08901, USA
| | - R O Hughes
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
- Department of Physics, University of Richmond, Virginia 23173, USA
| | - B Manning
- Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08901, USA
| | - S D Pain
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - W A Peters
- Oak Ridge Associated Universities, Oak Ridge, Tennessee 37831, USA
| | - S Rice
- Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08901, USA
| | - T J Ross
- Department of Physics, University of Richmond, Virginia 23173, USA
| | - N D Scielzo
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - C Shand
- Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08901, USA
- Department of Physics, University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom
| | - K Smith
- Los Alamos National Laboratory, Los Alamos, New Mexico 87544, USA
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5
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Bennett MB, Wrede C, Brown BA, Liddick SN, Pérez-Loureiro D, Bardayan DW, Chen AA, Chipps KA, Fry C, Glassman BE, Langer C, Larson NR, McNeice EI, Meisel Z, Ong W, O'Malley PD, Pain SD, Prokop CJ, Schatz H, Schwartz SB, Suchyta S, Thompson P, Walters M, Xu X. Isospin Mixing Reveals ^{30}P(p,γ)^{31}S Resonance Influencing Nova Nucleosynthesis. Phys Rev Lett 2016; 116:102502. [PMID: 27015475 DOI: 10.1103/physrevlett.116.102502] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2015] [Indexed: 06/05/2023]
Abstract
The thermonuclear ^{30}P(p,γ)^{31}S reaction rate is critical for modeling the final elemental and isotopic abundances of ONe nova nucleosynthesis, which affect the calibration of proposed nova thermometers and the identification of presolar nova grains, respectively. Unfortunately, the rate of this reaction is essentially unconstrained experimentally, because the strengths of key ^{31}S proton capture resonance states are not known, largely due to uncertainties in their spins and parities. Using the β decay of ^{31}Cl, we have observed the β-delayed γ decay of a ^{31}S state at E_{x}=6390.2(7) keV, with a ^{30}P(p,γ)^{31}S resonance energy of E_{r}=259.3(8) keV, in the middle of the ^{30}P(p,γ)^{31}S Gamow window for peak nova temperatures. This state exhibits isospin mixing with the nearby isobaric analog state at E_{x}=6279.0(6) keV, giving it an unambiguous spin and parity of 3/2^{+} and making it an important l=0 resonance for proton capture on ^{30}P.
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Affiliation(s)
- M B Bennett
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - C Wrede
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - B A Brown
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - S N Liddick
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - D Pérez-Loureiro
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - D W Bardayan
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - A A Chen
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada
| | - K A Chipps
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - C Fry
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - B E Glassman
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - C Langer
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - N R Larson
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - E I McNeice
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada
| | - Z Meisel
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - W Ong
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - P D O'Malley
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - S D Pain
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - C J Prokop
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - H Schatz
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - S B Schwartz
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Geology and Physics, University of Southern Indiana, Evansville, Indiana 47712, USA
| | - S Suchyta
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - P Thompson
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - M Walters
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada
| | - X Xu
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
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6
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Pain SD, Bardayan DW, Blackmon JC, Brown SM, Chae KY, Chipps KA, Cizewski JA, Jones KL, Kozub RL, Liang JF, Matei C, Matos M, Moazen BH, Nesaraja CD, Okołowicz J, O'Malley PD, Peters WA, Pittman ST, Płoszajczak M, Schmitt KT, Shriner JF, Shapira D, Smith MS, Stracener DW, Wilson GL. Constraint of the astrophysical ^{26g}Al(p,γ)^{27}Si destruction rate at stellar temperatures. Phys Rev Lett 2015; 114:212501. [PMID: 26066430 DOI: 10.1103/physrevlett.114.212501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2014] [Indexed: 06/04/2023]
Abstract
The Galactic 1.809-MeV γ-ray signature from the β decay of ^{26g}Al is a dominant target of γ-ray astronomy, of which a significant component is understood to originate from massive stars. The ^{26g}Al(p,γ)^{27}Si reaction is a major destruction pathway for ^{26g}Al at stellar temperatures, but the reaction rate is poorly constrained due to uncertainties in the strengths of low-lying resonances in ^{27}Si. The ^{26g}Al(d,p)^{27}Al reaction has been employed in inverse kinematics to determine the spectroscopic factors, and hence resonance strengths, of proton resonances in ^{27}Si via mirror symmetry. The strength of the 127-keV resonance is found to be a factor of 4 higher than the previously adopted upper limit, and the upper limit for the 68-keV resonance has been reduced by an order of magnitude, considerably constraining the ^{26g}Al destruction rate at stellar temperatures.
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Affiliation(s)
- S D Pain
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - D W Bardayan
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - J C Blackmon
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - S M Brown
- Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom
| | - K Y Chae
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
- Department of Physics, Sungkyunkwan University, Suwon 440-746, Korea
| | - K A Chipps
- Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08903, USA
| | - J A Cizewski
- Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08903, USA
| | - K L Jones
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - R L Kozub
- Department of Physics, Tennessee Technological University, Cookeville, Tennessee 38505, USA
| | - J F Liang
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - C Matei
- Oak Ridge Associated Universities, Building 6008, P.O. Box 2008, Oak Ridge, Tennessee 37831-6374, USA
| | - M Matos
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - B H Moazen
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - C D Nesaraja
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - J Okołowicz
- Institute of Nuclear Physics, Polish Academy of Sciences, Radzikowskiego 152, PL-31342 Kraków, Poland
| | - P D O'Malley
- Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08903, USA
| | - W A Peters
- Oak Ridge Associated Universities, Building 6008, P.O. Box 2008, Oak Ridge, Tennessee 37831-6374, USA
| | - S T Pittman
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - M Płoszajczak
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DSMCNRS/IN2P3, Boîte Postale 55027, F-14076 Caen Cedex, France
| | - K T Schmitt
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - J F Shriner
- Department of Physics, Tennessee Technological University, Cookeville, Tennessee 38505, USA
| | - D Shapira
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - M S Smith
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - D W Stracener
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - G L Wilson
- Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom
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7
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Allmond JM, Stuchbery AE, Beene JR, Galindo-Uribarri A, Liang JF, Padilla-Rodal E, Radford DC, Varner RL, Ayres A, Batchelder JC, Bey A, Bingham CR, Howard ME, Jones KL, Manning B, Mueller PE, Nesaraja CD, Pain SD, Peters WA, Ratkiewicz A, Schmitt KT, Shapira D, Smith MS, Stone NJ, Stracener DW, Yu CH. Double-magic nature of 132Sn and 208Pb through lifetime and cross-section measurements. Phys Rev Lett 2014; 112:172701. [PMID: 24836240 DOI: 10.1103/physrevlett.112.172701] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2014] [Indexed: 06/03/2023]
Abstract
Single-neutron states in (133)Sn and (209)Pb, which are analogous to single-electron states outside of closed atomic shells in alkali metals, were populated by the ((9)Be, (8)Be) one-neutron transfer reaction in inverse kinematics using particle-γ coincidence spectroscopy. In addition, the s(1/2) single-neutron hole-state candidate in (131)Sn was populated by ((9)Be, (10)Be). Doubly closed-shell (132)Sn (radioactive) and (208)Pb (stable) beams were used at sub-Coulomb barrier energies of 3 MeV per nucleon. Level energies, γ-ray transitions, absolute cross sections, spectroscopic factors, asymptotic normalization coefficients, and excited-state lifetimes are reported and compared with shell-model expectations. The results include a new transition and precise level energy for the 3p(1/2) candidate in (133)Sn, new absolute cross sections for the 1h(9/2) candidate in (133)Sn and 3s(1/2) candidate in (131)Sn, and new lifetimes for excited states in (133)Sn and (209)Pb. This is the first report on excited-state lifetimes of (133)Sn, which allow for a unique test of the nuclear shell model and (132)Sn double-shell closure.
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Affiliation(s)
- J M Allmond
- JINPA, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - A E Stuchbery
- Department of Nuclear Physics, Australian National University, Canberra ACT 0200, Australia
| | - J R Beene
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - A Galindo-Uribarri
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA and Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - J F Liang
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - E Padilla-Rodal
- Instituto de Ciencias Nucleares, UNAM, AP 70-543, 04510 Mexico, D.F., Mexico
| | - D C Radford
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - R L Varner
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - A Ayres
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - J C Batchelder
- UNIRIB, Oak Ridge Associated Universities, Oak Ridge, Tennessee 37831, USA
| | - A Bey
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - C R Bingham
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA and Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - M E Howard
- Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08903, USA
| | - K L Jones
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - B Manning
- Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08903, USA
| | - P E Mueller
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - C D Nesaraja
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - S D Pain
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - W A Peters
- Oak Ridge Associated Universities, Oak Ridge, Tennessee 37830, USA
| | - A Ratkiewicz
- Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08903, USA
| | - K T Schmitt
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA and Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - D Shapira
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - M S Smith
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - N J Stone
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA and Department of Physics, Oxford University, Oxford OX1 3PU, United Kingdom
| | - D W Stracener
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - C-H Yu
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
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8
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Bennett MB, Wrede C, Chipps KA, José J, Liddick SN, Santia M, Bowe A, Chen AA, Cooper N, Irvine D, McNeice E, Montes F, Naqvi F, Ortez R, Pain SD, Pereira J, Prokop C, Quaglia J, Quinn SJ, Schwartz SB, Shanab S, Simon A, Spyrou A, Thiagalingam E. Classical-NOVA CONTRIBUTION to the Milky Way's ²⁶Al abundance: exit channel of the key ²⁵Al(p,γ) ²⁶Si resonance. Phys Rev Lett 2013; 111:232503. [PMID: 24476263 DOI: 10.1103/physrevlett.111.232503] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2013] [Revised: 10/07/2013] [Indexed: 06/03/2023]
Abstract
Classical novae are expected to contribute to the 1809-keV Galactic γ-ray emission by producing its precursor 26Al, but the yield depends on the thermonuclear rate of the unmeasured 25Al(p,γ)26Si reaction. Using the β decay of 26P to populate the key J(π)=3(+) resonance in this reaction, we report the first evidence for the observation of its exit channel via a 1741.6±0.6(stat)±0.3(syst) keV primary γ ray, where the uncertainties are statistical and systematic, respectively. By combining the measured γ-ray energy and intensity with other experimental data on 26Si, we find the center-of-mass energy and strength of the resonance to be E(r)=414.9±0.6(stat)±0.3(syst)±0.6(lit.) keV and ωγ=23±6(stat)(-10)(+11)(lit.) meV, respectively, where the last uncertainties are from adopted literature data. We use hydrodynamic nova simulations to model 26Al production showing that these measurements effectively eliminate the dominant experimental nuclear-physics uncertainty and we estimate that novae may contribute up to 30% of the Galactic 26Al.
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Affiliation(s)
- M B Bennett
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA and National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - C Wrede
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA and National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Department of Physics, University of Washington, Seattle, Washington 98195, USA
| | - K A Chipps
- Department of Physics, Colorado School of Mines, Golden, Colorado 08401, USA
| | - J José
- Departament Física i Enginyeria Nuclear (UPC) and Institut d'Estudis Espacials de Catalunya (IEEC), E-08034 Barcelona, Spain
| | - S N Liddick
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - M Santia
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA and National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - A Bowe
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA and National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Physics Department, Kalamazoo College, Kalamazoo, Michigan 49006, USA
| | - A A Chen
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada
| | - N Cooper
- Department of Physics and Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520, USA
| | - D Irvine
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada
| | - E McNeice
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada
| | - F Montes
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - F Naqvi
- Department of Physics and Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520, USA
| | - R Ortez
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA and National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Department of Physics, University of Washington, Seattle, Washington 98195, USA
| | - S D Pain
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - J Pereira
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - C Prokop
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - J Quaglia
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA and Department of Electrical Engineering, Michigan State University, East Lansing, Michigan 48824, USA
| | - S J Quinn
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA and National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - S B Schwartz
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA and National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Geology and Physics Department, University of Southern Indiana, Evansville, Indiana 47712, USA
| | - S Shanab
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA and National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - A Simon
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - A Spyrou
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA and National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - E Thiagalingam
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada
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9
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Kozub RL, Arbanas G, Adekola AS, Bardayan DW, Blackmon JC, Chae KY, Chipps KA, Cizewski JA, Erikson L, Hatarik R, Hix WR, Jones KL, Krolas W, Liang JF, Ma Z, Matei C, Moazen BH, Nesaraja CD, Pain SD, Shapira D, Shriner JF, Smith MS, Swan TP. Neutron single particle structure in 131Sn and direct neutron capture cross sections. Phys Rev Lett 2012; 109:172501. [PMID: 23215181 DOI: 10.1103/physrevlett.109.172501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2012] [Revised: 07/17/2012] [Indexed: 06/01/2023]
Abstract
Recent calculations suggest that the rate of neutron capture by (130)Sn has a significant impact on late-time nucleosynthesis in the r process. Direct capture into low-lying bound states is expected to be significant in neutron capture near the N=82 closed shell, so r-process reaction rates may be strongly impacted by the properties of neutron single particle states in this region. In order to investigate these properties, the (d,p) reaction has been studied in inverse kinematics using a 630 MeV beam of (130)Sn (4.8 MeV/u) and a (CD(2))(n) target. An array of Si strip detectors, including the Silicon Detector Array and an early implementation of the Oak Ridge Rutgers University Barrel Array, was used to detect reaction products. Results for the (130)Sn(d, p)(131)Sn reaction are found to be very similar to those from the previously reported (132)Sn(d, p)(133)Sn reaction. Direct-semidirect (n,γ) cross section calculations, based for the first time on experimental data, are presented. The uncertainties in these cross sections are thus reduced by orders of magnitude from previous estimates.
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Affiliation(s)
- R L Kozub
- Department of Physics, Tennessee Technological University, Cookeville, Tennessee 38505, USA
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10
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Schmitt KT, Jones KL, Bey A, Ahn SH, Bardayan DW, Blackmon JC, Brown SM, Chae KY, Chipps KA, Cizewski JA, Hahn KI, Kolata JJ, Kozub RL, Liang JF, Matei C, Matoš M, Matyas D, Moazen B, Nesaraja C, Nunes FM, O'Malley PD, Pain SD, Peters WA, Pittman ST, Roberts A, Shapira D, Shriner JF, Smith MS, Spassova I, Stracener DW, Villano AN, Wilson GL. Halo nucleus 11Be: a spectroscopic study via neutron transfer. Phys Rev Lett 2012; 108:192701. [PMID: 23003029 DOI: 10.1103/physrevlett.108.192701] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2012] [Indexed: 06/01/2023]
Abstract
The best examples of halo nuclei, exotic systems with a diffuse nuclear cloud surrounding a tightly bound core, are found in the light, neutron-rich region, where the halo neutrons experience only weak binding and a weak, or no, potential barrier. Modern direct-reaction measurement techniques provide powerful probes of the structure of exotic nuclei. Despite more than four decades of these studies on the benchmark one-neutron halo nucleus 11Be, the spectroscopic factors for the two bound states remain poorly constrained. In the present work, the 10Be(d,p) reaction has been used in inverse kinematics at four beam energies to study the structure of 11Be. The spectroscopic factors extracted using the adiabatic model were found to be consistent across the four measurements and were largely insensitive to the optical potential used. The extracted spectroscopic factor for a neutron in an nℓj=2s(1/2) state coupled to the ground state of 10Be is 0.71(5). For the first excited state at 0.32 MeV, a spectroscopic factor of 0.62(4) is found for the halo neutron in a 1p(1/2) state.
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Affiliation(s)
- K T Schmitt
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
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11
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Catford WN, Timis CN, Lemmon RC, Labiche M, Orr NA, Fernández-Domínguez B, Chapman R, Freer M, Chartier M, Savajols H, Rejmund M, Achouri NL, Amzal N, Ashwood NI, Baldwin TD, Burns M, Caballero L, Casadjian JM, Curtis N, de France G, Gelletly W, Liang X, Pain SD, Pucknell VPE, Rubio B, Sorlin O, Spohr K, Theisen C, Warner DD. Migration of nuclear shell gaps studied in the d(24Ne,pγ)25Ne reaction. Phys Rev Lett 2010; 104:192501. [PMID: 20866960 DOI: 10.1103/physrevlett.104.192501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2009] [Indexed: 05/29/2023]
Abstract
The transfer of neutrons onto 24Ne has been measured using a reaccelerated radioactive beam of 24Ne to study the (d,p) reaction in inverse kinematics. The unusual raising of the first 3/2+ level in 25Ne and its significance in terms of the migration of the neutron magic number from N=20 to N=16 is put on a firm footing by confirmation of this state's identity. The raised 3/2+ level is observed simultaneously with the intruder negative parity 7/2- and 3/2- levels, providing evidence for the reduction in the N=20 gap. The coincident gamma-ray decays allowed the assignment of spins as well as the transferred orbital angular momentum. The excitation energy of the 3/2+ state shows that the established USD shell model breaks down well within the sd model space and requires a revised treatment of the proton-neutron monopole interaction.
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Affiliation(s)
- W N Catford
- Department of Physics, University of Surrey, Guildford GU2 5XH, United Kingdom
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12
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Jones KL, Adekola AS, Bardayan DW, Blackmon JC, Chae KY, Chipps KA, Cizewski JA, Erikson L, Harlin C, Hatarik R, Kapler R, Kozub RL, Liang JF, Livesay R, Ma Z, Moazen BH, Nesaraja CD, Nunes FM, Pain SD, Patterson NP, Shapira D, Shriner JF, Smith MS, Swan TP, Thomas JS. The magic nature of 132Sn explored through the single-particle states of 133Sn. Nature 2010; 465:454-7. [DOI: 10.1038/nature09048] [Citation(s) in RCA: 170] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2010] [Accepted: 03/26/2010] [Indexed: 11/09/2022]
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13
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Chipps KA, Bardayan DW, Blackmon JC, Chae KY, Greife U, Hatarik R, Kozub RL, Matei C, Moazen BH, Nesaraja CD, Pain SD, Peters WA, Pittman ST, Shriner JF, Smith MS. First Direct Measurement of the 17F(p,gamma)18Ne Cross Section. Phys Rev Lett 2009; 102:152502. [PMID: 19518624 DOI: 10.1103/physrevlett.102.152502] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2008] [Indexed: 05/27/2023]
Abstract
The rate of the (17)F(p,gamma)(18)Ne reaction is important in various astrophysical events. A previous (17)F(p,p)(17)F measurement identified a 3;{+} state providing the strongest resonance contribution, but the resonance strength was unknown. We have directly measured the (17)F(p,gamma)(18)Ne reaction using a mixed beam of (17)F and (17)O at ORNL. The resonance strength for the 3;{+} resonance in (18)Ne was found to be omegagamma = 33 +/- 14(stat) +/-1 7(syst) meV, corresponding to a gamma width of Gamma_{gamma} = 56 +/- 24(stat) +/- 30(syst) meV. An upper limit on the direct capture of S(E) <or= 65 keV b was determined at an energy of 800 keV.
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Affiliation(s)
- K A Chipps
- Colorado School of Mines, Golden, Colorado 80401, USA
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14
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Pain SD, Catford WN, Orr NA, Angélique JC, Ashwood NI, Bouchat V, Clarke NM, Curtis N, Freer M, Fulton BR, Hanappe F, Labiche M, Lecouey JL, Lemmon RC, Mahboub D, Ninane A, Normand G, Soić N, Stuttge L, Timis CN, Tostevin JA, Winfield JS, Ziman V. Structure of 12Be: intruder d-wave strength at N=8. Phys Rev Lett 2006; 96:032502. [PMID: 16486692 DOI: 10.1103/physrevlett.96.032502] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2005] [Indexed: 05/06/2023]
Abstract
The breaking of the N=8 shell-model magic number in the 12Be ground state has been determined to include significant occupancy of the intruder d-wave orbital. This is in marked contrast with all other N=8 isotones, both more and less exotic than 12Be. The occupancies of the [FORMULA: SEE TEXT]orbital and the [FORMULA: SEE TEXT], intruder orbital were deduced from a measurement of neutron removal from a high-energy 12Be beam leading to bound and unbound states in 11Be.
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Affiliation(s)
- S D Pain
- Department of Physics, University of Surrey, Guildford, GU2 7XH, United Kingdom
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